116 / 2022-04-26 15:12:42

Analytical models on the influence of crack geometrical pattern on capsule dosage

Self-healing; Crack geometrical pattern; Capsule dosage; Geometrical probability; Analytical model.

Cracks at various scale levels are detrimental to the durability of concrete. Seal-healing technology is increasingly being used to extend the service life of structural materials. Numerous studies examined the efficiency of crack healing using experimental techniques, such as local morphological observation as well as mechanical or transport testing. Assuming that the crack geometrical pattern is known in advance, we wonder whether a theoretical model can be created to estimate the required dosage of the healing capsule. As a consequence, the complex geometrical pattern of an actual crack in materials is first reduced into a continuum or discrete crack network. Then, utilizing geometrical probability theory, analytical models of the capsule dosage are established for self-healing of cracks with various simplified geometrical patterns and varying capsule length to crack spacing ratios. Finally, the numerical simulation is performed to verify the reliability of the above analytical models.